Proton emission from drip-line nuclei157Taand161Re

Proton radioactivities from {sup 157}Ta and {sup 161}Re are reported. Fusion-evaporation residues from the reaction of 270 MeV {sup 58}Ni ions on {sup 102}Pd and {sup 106}Cd targets were separated according to M/Q and implanted into a double-sided silicon strip detector. One line from {sup 157}Ta was observed with a proton energy of 927(7) keV [t{sub 1/2}=10.1(4) ms, b{sub p}=3.4(12){percent}] from the {pi}s{sub 1/2} ground state. A new alpha decay transition with energy 6117(4) keV was also observed from this state. Two proton lines from {sup 161}Re were observed with energies 1192(6) keV [t{sub 1/2}=0.37(4) ms, b{sub p}=100(7){percent}] and 1315(7) keV [t{sub 1/2}=16(1) ms, b{sub p}=4.8(6){percent}] from the {pi}s{sub 1/2} and {pi}h{sub 11/2} states, respectively. {copyright} {ital 1997} {ital The American Physical Society}